summaryrefslogtreecommitdiff
path: root/drivers/serial/apbuart.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/serial/apbuart.c')
-rw-r--r--drivers/serial/apbuart.c709
1 files changed, 0 insertions, 709 deletions
diff --git a/drivers/serial/apbuart.c b/drivers/serial/apbuart.c
deleted file mode 100644
index 095a5d562618..000000000000
--- a/drivers/serial/apbuart.c
+++ /dev/null
@@ -1,709 +0,0 @@
-/*
- * Driver for GRLIB serial ports (APBUART)
- *
- * Based on linux/drivers/serial/amba.c
- *
- * Copyright (C) 2000 Deep Blue Solutions Ltd.
- * Copyright (C) 2003 Konrad Eisele <eiselekd@web.de>
- * Copyright (C) 2006 Daniel Hellstrom <daniel@gaisler.com>, Aeroflex Gaisler AB
- * Copyright (C) 2008 Gilead Kutnick <kutnickg@zin-tech.com>
- * Copyright (C) 2009 Kristoffer Glembo <kristoffer@gaisler.com>, Aeroflex Gaisler AB
- */
-
-#if defined(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
-#define SUPPORT_SYSRQ
-#endif
-
-#include <linux/module.h>
-#include <linux/tty.h>
-#include <linux/ioport.h>
-#include <linux/init.h>
-#include <linux/serial.h>
-#include <linux/console.h>
-#include <linux/sysrq.h>
-#include <linux/kthread.h>
-#include <linux/device.h>
-#include <linux/of.h>
-#include <linux/of_device.h>
-#include <linux/of_platform.h>
-#include <linux/of_irq.h>
-#include <linux/platform_device.h>
-#include <linux/io.h>
-#include <linux/serial_core.h>
-#include <asm/irq.h>
-
-#include "apbuart.h"
-
-#define SERIAL_APBUART_MAJOR TTY_MAJOR
-#define SERIAL_APBUART_MINOR 64
-#define UART_DUMMY_RSR_RX 0x8000 /* for ignore all read */
-
-static void apbuart_tx_chars(struct uart_port *port);
-
-static void apbuart_stop_tx(struct uart_port *port)
-{
- unsigned int cr;
-
- cr = UART_GET_CTRL(port);
- cr &= ~UART_CTRL_TI;
- UART_PUT_CTRL(port, cr);
-}
-
-static void apbuart_start_tx(struct uart_port *port)
-{
- unsigned int cr;
-
- cr = UART_GET_CTRL(port);
- cr |= UART_CTRL_TI;
- UART_PUT_CTRL(port, cr);
-
- if (UART_GET_STATUS(port) & UART_STATUS_THE)
- apbuart_tx_chars(port);
-}
-
-static void apbuart_stop_rx(struct uart_port *port)
-{
- unsigned int cr;
-
- cr = UART_GET_CTRL(port);
- cr &= ~(UART_CTRL_RI);
- UART_PUT_CTRL(port, cr);
-}
-
-static void apbuart_enable_ms(struct uart_port *port)
-{
- /* No modem status change interrupts for APBUART */
-}
-
-static void apbuart_rx_chars(struct uart_port *port)
-{
- struct tty_struct *tty = port->state->port.tty;
- unsigned int status, ch, rsr, flag;
- unsigned int max_chars = port->fifosize;
-
- status = UART_GET_STATUS(port);
-
- while (UART_RX_DATA(status) && (max_chars--)) {
-
- ch = UART_GET_CHAR(port);
- flag = TTY_NORMAL;
-
- port->icount.rx++;
-
- rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX;
- UART_PUT_STATUS(port, 0);
- if (rsr & UART_STATUS_ERR) {
-
- if (rsr & UART_STATUS_BR) {
- rsr &= ~(UART_STATUS_FE | UART_STATUS_PE);
- port->icount.brk++;
- if (uart_handle_break(port))
- goto ignore_char;
- } else if (rsr & UART_STATUS_PE) {
- port->icount.parity++;
- } else if (rsr & UART_STATUS_FE) {
- port->icount.frame++;
- }
- if (rsr & UART_STATUS_OE)
- port->icount.overrun++;
-
- rsr &= port->read_status_mask;
-
- if (rsr & UART_STATUS_PE)
- flag = TTY_PARITY;
- else if (rsr & UART_STATUS_FE)
- flag = TTY_FRAME;
- }
-
- if (uart_handle_sysrq_char(port, ch))
- goto ignore_char;
-
- uart_insert_char(port, rsr, UART_STATUS_OE, ch, flag);
-
-
- ignore_char:
- status = UART_GET_STATUS(port);
- }
-
- tty_flip_buffer_push(tty);
-}
-
-static void apbuart_tx_chars(struct uart_port *port)
-{
- struct circ_buf *xmit = &port->state->xmit;
- int count;
-
- if (port->x_char) {
- UART_PUT_CHAR(port, port->x_char);
- port->icount.tx++;
- port->x_char = 0;
- return;
- }
-
- if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
- apbuart_stop_tx(port);
- return;
- }
-
- /* amba: fill FIFO */
- count = port->fifosize >> 1;
- do {
- UART_PUT_CHAR(port, xmit->buf[xmit->tail]);
- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
- port->icount.tx++;
- if (uart_circ_empty(xmit))
- break;
- } while (--count > 0);
-
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
- uart_write_wakeup(port);
-
- if (uart_circ_empty(xmit))
- apbuart_stop_tx(port);
-}
-
-static irqreturn_t apbuart_int(int irq, void *dev_id)
-{
- struct uart_port *port = dev_id;
- unsigned int status;
-
- spin_lock(&port->lock);
-
- status = UART_GET_STATUS(port);
- if (status & UART_STATUS_DR)
- apbuart_rx_chars(port);
- if (status & UART_STATUS_THE)
- apbuart_tx_chars(port);
-
- spin_unlock(&port->lock);
-
- return IRQ_HANDLED;
-}
-
-static unsigned int apbuart_tx_empty(struct uart_port *port)
-{
- unsigned int status = UART_GET_STATUS(port);
- return status & UART_STATUS_THE ? TIOCSER_TEMT : 0;
-}
-
-static unsigned int apbuart_get_mctrl(struct uart_port *port)
-{
- /* The GRLIB APBUART handles flow control in hardware */
- return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
-}
-
-static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl)
-{
- /* The GRLIB APBUART handles flow control in hardware */
-}
-
-static void apbuart_break_ctl(struct uart_port *port, int break_state)
-{
- /* We don't support sending break */
-}
-
-static int apbuart_startup(struct uart_port *port)
-{
- int retval;
- unsigned int cr;
-
- /* Allocate the IRQ */
- retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port);
- if (retval)
- return retval;
-
- /* Finally, enable interrupts */
- cr = UART_GET_CTRL(port);
- UART_PUT_CTRL(port,
- cr | UART_CTRL_RE | UART_CTRL_TE |
- UART_CTRL_RI | UART_CTRL_TI);
-
- return 0;
-}
-
-static void apbuart_shutdown(struct uart_port *port)
-{
- unsigned int cr;
-
- /* disable all interrupts, disable the port */
- cr = UART_GET_CTRL(port);
- UART_PUT_CTRL(port,
- cr & ~(UART_CTRL_RE | UART_CTRL_TE |
- UART_CTRL_RI | UART_CTRL_TI));
-
- /* Free the interrupt */
- free_irq(port->irq, port);
-}
-
-static void apbuart_set_termios(struct uart_port *port,
- struct ktermios *termios, struct ktermios *old)
-{
- unsigned int cr;
- unsigned long flags;
- unsigned int baud, quot;
-
- /* Ask the core to calculate the divisor for us. */
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16);
- if (baud == 0)
- panic("invalid baudrate %i\n", port->uartclk / 16);
-
- /* uart_get_divisor calc a *16 uart freq, apbuart is *8 */
- quot = (uart_get_divisor(port, baud)) * 2;
- cr = UART_GET_CTRL(port);
- cr &= ~(UART_CTRL_PE | UART_CTRL_PS);
-
- if (termios->c_cflag & PARENB) {
- cr |= UART_CTRL_PE;
- if ((termios->c_cflag & PARODD))
- cr |= UART_CTRL_PS;
- }
-
- /* Enable flow control. */
- if (termios->c_cflag & CRTSCTS)
- cr |= UART_CTRL_FL;
-
- spin_lock_irqsave(&port->lock, flags);
-
- /* Update the per-port timeout. */
- uart_update_timeout(port, termios->c_cflag, baud);
-
- port->read_status_mask = UART_STATUS_OE;
- if (termios->c_iflag & INPCK)
- port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE;
-
- /* Characters to ignore */
- port->ignore_status_mask = 0;
- if (termios->c_iflag & IGNPAR)
- port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE;
-
- /* Ignore all characters if CREAD is not set. */
- if ((termios->c_cflag & CREAD) == 0)
- port->ignore_status_mask |= UART_DUMMY_RSR_RX;
-
- /* Set baud rate */
- quot -= 1;
- UART_PUT_SCAL(port, quot);
- UART_PUT_CTRL(port, cr);
-
- spin_unlock_irqrestore(&port->lock, flags);
-}
-
-static const char *apbuart_type(struct uart_port *port)
-{
- return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL;
-}
-
-static void apbuart_release_port(struct uart_port *port)
-{
- release_mem_region(port->mapbase, 0x100);
-}
-
-static int apbuart_request_port(struct uart_port *port)
-{
- return request_mem_region(port->mapbase, 0x100, "grlib-apbuart")
- != NULL ? 0 : -EBUSY;
- return 0;
-}
-
-/* Configure/autoconfigure the port */
-static void apbuart_config_port(struct uart_port *port, int flags)
-{
- if (flags & UART_CONFIG_TYPE) {
- port->type = PORT_APBUART;
- apbuart_request_port(port);
- }
-}
-
-/* Verify the new serial_struct (for TIOCSSERIAL) */
-static int apbuart_verify_port(struct uart_port *port,
- struct serial_struct *ser)
-{
- int ret = 0;
- if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART)
- ret = -EINVAL;
- if (ser->irq < 0 || ser->irq >= NR_IRQS)
- ret = -EINVAL;
- if (ser->baud_base < 9600)
- ret = -EINVAL;
- return ret;
-}
-
-static struct uart_ops grlib_apbuart_ops = {
- .tx_empty = apbuart_tx_empty,
- .set_mctrl = apbuart_set_mctrl,
- .get_mctrl = apbuart_get_mctrl,
- .stop_tx = apbuart_stop_tx,
- .start_tx = apbuart_start_tx,
- .stop_rx = apbuart_stop_rx,
- .enable_ms = apbuart_enable_ms,
- .break_ctl = apbuart_break_ctl,
- .startup = apbuart_startup,
- .shutdown = apbuart_shutdown,
- .set_termios = apbuart_set_termios,
- .type = apbuart_type,
- .release_port = apbuart_release_port,
- .request_port = apbuart_request_port,
- .config_port = apbuart_config_port,
- .verify_port = apbuart_verify_port,
-};
-
-static struct uart_port grlib_apbuart_ports[UART_NR];
-static struct device_node *grlib_apbuart_nodes[UART_NR];
-
-static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber)
-{
- int ctrl, loop = 0;
- int status;
- int fifosize;
- unsigned long flags;
-
- ctrl = UART_GET_CTRL(port);
-
- /*
- * Enable the transceiver and wait for it to be ready to send data.
- * Clear interrupts so that this process will not be externally
- * interrupted in the middle (which can cause the transceiver to
- * drain prematurely).
- */
-
- local_irq_save(flags);
-
- UART_PUT_CTRL(port, ctrl | UART_CTRL_TE);
-
- while (!UART_TX_READY(UART_GET_STATUS(port)))
- loop++;
-
- /*
- * Disable the transceiver so data isn't actually sent during the
- * actual test.
- */
-
- UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE));
-
- fifosize = 1;
- UART_PUT_CHAR(port, 0);
-
- /*
- * So long as transmitting a character increments the tranceivier FIFO
- * length the FIFO must be at least that big. These bytes will
- * automatically drain off of the FIFO.
- */
-
- status = UART_GET_STATUS(port);
- while (((status >> 20) & 0x3F) == fifosize) {
- fifosize++;
- UART_PUT_CHAR(port, 0);
- status = UART_GET_STATUS(port);
- }
-
- fifosize--;
-
- UART_PUT_CTRL(port, ctrl);
- local_irq_restore(flags);
-
- if (fifosize == 0)
- fifosize = 1;
-
- return fifosize;
-}
-
-static void apbuart_flush_fifo(struct uart_port *port)
-{
- int i;
-
- for (i = 0; i < port->fifosize; i++)
- UART_GET_CHAR(port);
-}
-
-
-/* ======================================================================== */
-/* Console driver, if enabled */
-/* ======================================================================== */
-
-#ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE
-
-static void apbuart_console_putchar(struct uart_port *port, int ch)
-{
- unsigned int status;
- do {
- status = UART_GET_STATUS(port);
- } while (!UART_TX_READY(status));
- UART_PUT_CHAR(port, ch);
-}
-
-static void
-apbuart_console_write(struct console *co, const char *s, unsigned int count)
-{
- struct uart_port *port = &grlib_apbuart_ports[co->index];
- unsigned int status, old_cr, new_cr;
-
- /* First save the CR then disable the interrupts */
- old_cr = UART_GET_CTRL(port);
- new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI);
- UART_PUT_CTRL(port, new_cr);
-
- uart_console_write(port, s, count, apbuart_console_putchar);
-
- /*
- * Finally, wait for transmitter to become empty
- * and restore the TCR
- */
- do {
- status = UART_GET_STATUS(port);
- } while (!UART_TX_READY(status));
- UART_PUT_CTRL(port, old_cr);
-}
-
-static void __init
-apbuart_console_get_options(struct uart_port *port, int *baud,
- int *parity, int *bits)
-{
- if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) {
-
- unsigned int quot, status;
- status = UART_GET_STATUS(port);
-
- *parity = 'n';
- if (status & UART_CTRL_PE) {
- if ((status & UART_CTRL_PS) == 0)
- *parity = 'e';
- else
- *parity = 'o';
- }
-
- *bits = 8;
- quot = UART_GET_SCAL(port) / 8;
- *baud = port->uartclk / (16 * (quot + 1));
- }
-}
-
-static int __init apbuart_console_setup(struct console *co, char *options)
-{
- struct uart_port *port;
- int baud = 38400;
- int bits = 8;
- int parity = 'n';
- int flow = 'n';
-
- pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n",
- co, co->index, options);
-
- /*
- * Check whether an invalid uart number has been specified, and
- * if so, search for the first available port that does have
- * console support.
- */
- if (co->index >= grlib_apbuart_port_nr)
- co->index = 0;
-
- port = &grlib_apbuart_ports[co->index];
-
- spin_lock_init(&port->lock);
-
- if (options)
- uart_parse_options(options, &baud, &parity, &bits, &flow);
- else
- apbuart_console_get_options(port, &baud, &parity, &bits);
-
- return uart_set_options(port, co, baud, parity, bits, flow);
-}
-
-static struct uart_driver grlib_apbuart_driver;
-
-static struct console grlib_apbuart_console = {
- .name = "ttyS",
- .write = apbuart_console_write,
- .device = uart_console_device,
- .setup = apbuart_console_setup,
- .flags = CON_PRINTBUFFER,
- .index = -1,
- .data = &grlib_apbuart_driver,
-};
-
-
-static int grlib_apbuart_configure(void);
-
-static int __init apbuart_console_init(void)
-{
- if (grlib_apbuart_configure())
- return -ENODEV;
- register_console(&grlib_apbuart_console);
- return 0;
-}
-
-console_initcall(apbuart_console_init);
-
-#define APBUART_CONSOLE (&grlib_apbuart_console)
-#else
-#define APBUART_CONSOLE NULL
-#endif
-
-static struct uart_driver grlib_apbuart_driver = {
- .owner = THIS_MODULE,
- .driver_name = "serial",
- .dev_name = "ttyS",
- .major = SERIAL_APBUART_MAJOR,
- .minor = SERIAL_APBUART_MINOR,
- .nr = UART_NR,
- .cons = APBUART_CONSOLE,
-};
-
-
-/* ======================================================================== */
-/* OF Platform Driver */
-/* ======================================================================== */
-
-static int __devinit apbuart_probe(struct platform_device *op,
- const struct of_device_id *match)
-{
- int i = -1;
- struct uart_port *port = NULL;
-
- i = 0;
- for (i = 0; i < grlib_apbuart_port_nr; i++) {
- if (op->dev.of_node == grlib_apbuart_nodes[i])
- break;
- }
-
- port = &grlib_apbuart_ports[i];
- port->dev = &op->dev;
-
- uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port);
-
- apbuart_flush_fifo((struct uart_port *) port);
-
- printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n",
- (unsigned long long) port->mapbase, port->irq);
- return 0;
-}
-
-static struct of_device_id __initdata apbuart_match[] = {
- {
- .name = "GAISLER_APBUART",
- },
- {
- .name = "01_00c",
- },
- {},
-};
-
-static struct of_platform_driver grlib_apbuart_of_driver = {
- .probe = apbuart_probe,
- .driver = {
- .owner = THIS_MODULE,
- .name = "grlib-apbuart",
- .of_match_table = apbuart_match,
- },
-};
-
-
-static int grlib_apbuart_configure(void)
-{
- struct device_node *np, *rp;
- const u32 *prop;
- int freq_khz, line = 0;
-
- /* Get bus frequency */
- rp = of_find_node_by_path("/");
- if (!rp)
- return -ENODEV;
- rp = of_get_next_child(rp, NULL);
- if (!rp)
- return -ENODEV;
- prop = of_get_property(rp, "clock-frequency", NULL);
- if (!prop)
- return -ENODEV;
- freq_khz = *prop;
-
- for_each_matching_node(np, apbuart_match) {
- const int *irqs, *ampopts;
- const struct amba_prom_registers *regs;
- struct uart_port *port;
- unsigned long addr;
-
- ampopts = of_get_property(np, "ampopts", NULL);
- if (ampopts && (*ampopts == 0))
- continue; /* Ignore if used by another OS instance */
-
- irqs = of_get_property(np, "interrupts", NULL);
- regs = of_get_property(np, "reg", NULL);
-
- if (!irqs || !regs)
- continue;
-
- grlib_apbuart_nodes[line] = np;
-
- addr = regs->phys_addr;
-
- port = &grlib_apbuart_ports[line];
-
- port->mapbase = addr;
- port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map));
- port->irq = *irqs;
- port->iotype = UPIO_MEM;
- port->ops = &grlib_apbuart_ops;
- port->flags = UPF_BOOT_AUTOCONF;
- port->line = line;
- port->uartclk = freq_khz * 1000;
- port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line);
- line++;
-
- /* We support maximum UART_NR uarts ... */
- if (line == UART_NR)
- break;
- }
-
- grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line;
- return line ? 0 : -ENODEV;
-}
-
-static int __init grlib_apbuart_init(void)
-{
- int ret;
-
- /* Find all APBUARTS in device the tree and initialize their ports */
- ret = grlib_apbuart_configure();
- if (ret)
- return ret;
-
- printk(KERN_INFO "Serial: GRLIB APBUART driver\n");
-
- ret = uart_register_driver(&grlib_apbuart_driver);
-
- if (ret) {
- printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
- __FILE__, ret);
- return ret;
- }
-
- ret = of_register_platform_driver(&grlib_apbuart_of_driver);
- if (ret) {
- printk(KERN_ERR
- "%s: of_register_platform_driver failed (%i)\n",
- __FILE__, ret);
- uart_unregister_driver(&grlib_apbuart_driver);
- return ret;
- }
-
- return ret;
-}
-
-static void __exit grlib_apbuart_exit(void)
-{
- int i;
-
- for (i = 0; i < grlib_apbuart_port_nr; i++)
- uart_remove_one_port(&grlib_apbuart_driver,
- &grlib_apbuart_ports[i]);
-
- uart_unregister_driver(&grlib_apbuart_driver);
- of_unregister_platform_driver(&grlib_apbuart_of_driver);
-}
-
-module_init(grlib_apbuart_init);
-module_exit(grlib_apbuart_exit);
-
-MODULE_AUTHOR("Aeroflex Gaisler AB");
-MODULE_DESCRIPTION("GRLIB APBUART serial driver");
-MODULE_VERSION("2.1");
-MODULE_LICENSE("GPL");